setup block parameter typed to id instead of BBHTTPRequest

[Jasper Blues]

[[BBHTTPRequest readResource:@"http://foo.bar/baz/1"] setup:^(id request) {
    // Prepare request...
} execute:^(BBHTTPResponse* response) {
    // Handle response...
} error:^(NSError* error) {
    // Handle error...
} finally:^{
    // Do after error OR success.
}];

... why is the setup block parameter typed to id? Is it a BBHTTPRequest?